Spec : Temperature coefficient of Voc is - 0.30 %/
22.5 VOC ranging to 24.4
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Putting 4 words into google search found this: (excerpt)
< note, I too am now having issues even pasting from notepad >
Temperature Coefficient
If you look at the manufacturer's data sheet you will see a term called "temperature coefficient Pmax". For example the temperature coefficient of a Suntech 190 W (monocrystalline) solar panel isLast edited by Mike90250; 01-08-2017, 08:56 PM.Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
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Heh, no you do not have to have a Fluke. There are many that are just as accurate for our needs. The question is a matter of out-of-box trust, and also being a once or twice in a lifetime purchase. The lower end model 114 would do just fine.
If you know what you are doing, have friends gear or voltage references handy, then the big-box cheapo may suffice. If you don't, then you'll always be wondering in the back of your mind if despite the big-box claim of accuracy, if quality control makes me the one that pulled the dud from the rack, or goes out of spec a year down the road when you are now measuring kilobuck's worth of battery bank with a $10 meter...
Plenty of multimeter threads so no need to go haywire here.... Just how I look at things.Comment
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Spec : Temperature coefficient of Voc is - 0.30 %/
That is how much you should be derating your charge controller for your location. For your controller:
100V - 30% = 70V maximum array VOC.
You can run 3 in series but 4 puts you over the limit. Arranging the in a 2x2 would allow you to keep all 4 panels hooked up.
WWW
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Spec : Temperature coefficient of Voc is - 0.30 %/
That is how much you should be derating your charge controller for your location. For your controller:
100V - 30% = 70V maximum array VOC.
You can run 3 in series but 4 puts you over the limit. Arranging the in a 2x2 would allow you to keep all 4 panels hooked up.
WWW
Or are you assuming (probably incorrectly) that the low temp at the OP's location is -75C (-103F) for a total drop from 25C of 100C degrees?
If the outside (panel) temperature gets to, say, 50C (122F) in the summer at noon that does not matter at all for this calculation, since the reference Voc value is taken at a panel temp of 35C.
It would matter if you suspected that the Vmp might be too low for best battery charging at 50C.SunnyBoy 3000 US, 18 BP Solar 175B panels.Comment
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It won't let me write 0 degrees Celsius after that last temperature coefficient? What that means.Comment
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We are having a few formatting issues, hope it will be sorted out this week, thanks for everyone's patience.Comment
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The problem is most likely that he is trying to paste in a degree symbol that is in some escaped form, and that is triggering the SQL/HTML injection filter on the forum input. Note that, I think, the preview works fine and it is just when it tries to actually add it to the database that it gets blocked.SunnyBoy 3000 US, 18 BP Solar 175B panels.Comment
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